George savage



attra tarts lateat @time IMPROVED PLANKING SCREW.

itin ,Stintino munt in in tipa ttttcrs lntrnt mit uiting nut nt tige 5min.

TO ALL WHOM IT MAY CONCERN:

l Be it known that I, GEORGE SAVAGE, Jr., of Bangor, in the county of Penobscot, and State of Maine, have invented a new andusetul improvement on Flanking Screws; and I do hereby declare that the'following is c. full, clear, and exact description of the construction andoperation ci' the same, reference being had to thc accompanying drawingmaking a part of this specification, which drawing is a perspective view of my invention, applied to thcoutboard planking of a vessel. l

The nature of my invention consistsin a planking screw, which is attached to the vessel by adjustable arms or dogs, and is providedy with rollers which -allow the screw to follow the direction in which lthe plank, upon which it is operating, may be moved, thereby obviatng much of' the strain to which such work subjects 'screws ot ordinary construction.

To enable others skilled in the art to mak-e and use my invention, I will proceed to describe its construction :ind operation. y

After the frame of a vessel is set up, the inboard planking is usually first done, after which the outboard planking is pu-t on. But `whichever maybe last done, theapplication of the common clamp-screw, to force the planks against the timbers, is rendered difficult by the plankiug uponthe opposite side of the timber, for the reason that planking screws, as heretofore constructed, were designed to exert their force upon the Vopposite sides ofthe timber and plank which they were employed to bring together; hence the diiiculty of attaching the clump to the timbers when the opposite side was planked in.- Another diiiiculty 'attending the use of the common screw in planking vessels is the fact that owing to the lines of the vessel, many planks have not only to be bent sideways towards the timbers by the direct action of the screw, but they` have also to be bent lat the sametime edgewise by the application of wedges or other means, and as the clamp rigidly adheres to the timber wherever applied, the lateral strain uponthe screw is then more severe than the direct strain, often resulting in a broken or damaged screw or clamp. y

' Inthe drawings, A'A A represent vsectionsof frame timbers of a vessel. B isa section of'the inboard planking. G is a section ofthe outboard planking, which is being last done. D represents a short stpu't lever, having a female screw'forrned near 'one end, in which works the male screw F, while at the other end it is formed with a right-angled prop o r Af ulcrum, E. At thegextremity of this prop are attached the rollers a aa, which bear upon the timbers A'A,v A. G is a c'levis, sliding upon lever D; this clevis yis secured in any desired positionby the set-screw @while two small rollers, b b, which revolve upon the pins thatfsecure the -clevis to lever D, also bear upon the edge et' the lever, and insure its easy motion in passing through the clevis, when scrcwc is released. c e is a triangular link which plays loosely in a hole in clevis Gr. Attachednto' this linkare two dogs,.rZ ,'formed so as to be readily and securelyv attached to the timbers of-the vessel. .The link e e is so formed that the dogs, when attached both to the same timber, .draw upon the centre of the.'1ink, but when extended, they draw from the angles of the link. Y v

The'operation of this screw, when in use, is plainly shown in the drawings. The rollers aaa bear-.against timbers A A A, while dogs d d are 'fastened to one of the timbers A, and screw F operates against plank C, thereby forcing it against ,timbers A A. Should it be necessary to give the. plankC an edgewise bend, it is d'one by means ot' the wedge g driven between the plank and the boltf, which thereby -forces the plank downwards edgewise. And it will be apparent that as the plank C moves downwards, the screw F will follow the movementby reason of thc rollers a a a, in bearing E, and rollers b in the clevis G, allowing lever D to move in accordance with the plank which is being bent into place, thereby causing screw F toact directly uponA the plank, however much it may be bent edgewise after the screw is applied. This screw is adapted -to many uses upon vessels besides planking, and from its peculiar operation and feasibility of being attached, can be used where other vscrews cannot.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-.

1. The planking screw, consisting of lever D, with thc prop or fulcrum E, screw F, and dogs d d, attached to lever D, by the clevis G, or its equivalen t,lal1 arranged to operate' manner substantially as described and shown. f'

2. The rollers a a a, in fulcrum E, in combination with sliding clevis Gr, whereby to allow the adjustment of screw F, substantially in manner as and for the purpose specified.

` GEORGE SAVAGE, Jn.

Witnessesf H.l L. MITCHELL, Guo. R. SMITH.I 

